Researchers Warn of Impending Rockfall as Hochvogel Peak Widens
Geologists are closely monitoring a massive fissure on the Hochvogel mountain in the Allgäu Alps, where sensors have recorded unusually rapid movements.
Geologists and researchers monitoring the Hochvogel, a 2,592-meter peak in the Allgäu Alps along the German-Austrian border, warn that the mountain is steadily breaking apart due to an expanding rock fissure. While experts cannot yet predict the exact timing of the collapse, ongoing measurements indicate that the process is drawing closer.
The main fracture on the mountain has reached up to six meters in width and over 60 meters in depth, with a recently discovered secondary fracture, known as "Spalt 6," serving as a potential starting point for the major rockfall. Researchers from the Technical University of Munich (TUM) have tracked movements of up to five millimeters per week at the southwest edge of the mountain.
Dr. Johannes Leinauer from the Chair of Slope Movements at TUM noted that the mountain is continuously monitored with over 30 sensors providing data every ten minutes. "From a geological perspective, we are not talking about tomorrow or in a few days, but we are relatively close," Leinauer stated.
Climate change and severe weather events are believed to accelerate the widening of the fissure. According to Leinauer, stronger and more frequent thunderstorms and heavy rainfall drive the deformation process forward, which typically peaks during the spring snowmelt. Earlier in the year, a strong downpour resulted in a five-millimeter expansion of the gap, marking the largest deformation measured in recent years.
If the entire rock mass, estimated between 250,000 and 400,000 cubic meters, eventually gives way, it is expected to fall into the uninhabited Hornbachtal on the Austrian side. The extreme scenario could potentially impact the small Austrian village of Hinterhornbach, which has a population of around 90 residents, and would likely produce a massive cloud of dust across the valley.
Local officials on the German side have sought to reassure tourists and residents. Maximilian Hillmeier, tourism director of Bad Hindelang, stated that vacationers face no danger because the expected rockfall threatens the opposite side of the mountain.
The situation at the Hochvogel reflects broader geological shifts across the Alps, where rising temperatures and thawing permafrost are increasingly scrutinized by researchers studying mountain stability. While some scientists emphasize the complex interaction between thermal and hydraulic forces within rock formations, monitoring teams continue to gather critical data to better understand the escalating risks in alpine regions.